Hi OPCLabs,
After the help you provided and analysis with OPC server vendor some improvements to the server and its settings have been made.

We await for updated server version.

Thank you for your support!

No, there definitely isn't any difference between what the demo client does, and WriteMultipleItemValues.

Look for misconfigurations in your app or in the analyzer.

Hi OPCLabs,
We run OPC Analyzer, and configured it to connect to the OPC server as shown in attached image.
We modified our app to point to OPC Analyzer: However no traffic is traced on our writes, and data is there. Maybe because of WriteMultipleItemValues?

We see it catches single writes and reads from Demo Client.

Memo from the phone discussion: Happens relatively frequently. It appears that the old value is retained (no value written). Connect to Softing INat... OPC server. Suggested that attempting to write a Quality etc. should not be done - not related to the issue. Sending OPC Analyzer instructions and link over email.

Can you verify the written value directly on the server (or the equipment), or using some other OPC client connected to the same server?

What I am trying to establish is whether 1) the problem was already with the write, or 2) the value was written correctly, but was not reported back as it should.

And: Please clarify what you precisely mean by " some of the item has the different value ". Can you tell whether this means that A) the value has not been written at all, i.e. the item has retained its original value, or B ) at the moment of the Write, SOMETHING was written - but it appear to be something different from what you have sent.

Thank you

Hi OpcLabs,
We have an issue with data quality. It appears that the data sent from OPCLabs client to Softing’s I-Nat server isn’t recorded in the server.

• We send the data using DA: client.WriteMultipleItemValues(IList<DAItemValueArguments> writeArgs.ToArray())
• We check the results of sending using: operationResult.Succeeded of every result item
• All elements in result set have this flag as true.
• In rare occasions (e.g. 1 out of 700 items) some of the item has the different value in OPC server from what we sent.

How can we address this issue?
We created an app using OPCLabs component, so we can verify where the discrepancy is and are also monitoring the changes. The discrepancy is there already after the initial push.